The following is the Oct. 22, 2018 Congressional Research Service report, Navy Frigate (FFG(X)) Program: Background and Issues for Congress.
The Navy in 2017 initiated a new program, called the FFG(X) program, to build a class of 20 guided-missile frigates (FFGs). The Navy wants to procure the first FFG(X) in FY2020, the second in FY2021, and the remaining 18 at a rate of two per year in FY2022-FY2030. The Navy’s proposed FY2019 budget requests $134.8 million in research and development funding...
https://news.usni.org/2018/10/24/report-congress-u-s-navy-frigate-ffgx-program-4